mysql table

Often check the data table do not know the meaning of the field, and then to look at the design table to see the meaning of the field, the database has been modified by many people, database design documents can not support the current table

Customer's machine system abnormal shutdown, after restarting the MySQL database can not start normally, reinstall the system after the discovery of database file corruption, sad is that the customer database is not backed up in a timely manner,

Table IntroductionTable is equivalent to a file, a record in the table is equivalent to a row of the file, but a record in the table has a corresponding title, called the table fieldId,name,qq,age is called a field, the rest, a row of content is

1. Add Table record Insert a record: Insert [into] tab_name (field1,filed2,.......) VALUES (value1,value2,.......);　　　　　　　　　　　　　　　　　　　　　　　　　　　　 Insert multiple records: Insert [into] tab_name (field1,filed2,.......) VALUES (value1,value2,.......),

select TABLE_NAME, TABLE_SCHEMA, Data_free from information_schema.TABLES where TABLE_SCHEMA NOT IN (‘information_schema‘, ‘mysql‘) and Data_Free >0;+-----------------+--------------+-----------+|table_name|Table_schema|Data_free|+-----------------+-

1. Test add partition and delete Partition # # #添加删除range分区 (1) Create a partition:create table titles  (    emp_no       INT NOT NULL,    title        varchar (     not null,    from_date)    date            not null,     to_date     DATE,    KEY  

An introductionConstraints are the same as the width of the data type, which are optional parametersRole: To ensure the integrity and consistency of dataMainly divided into:PRIMARY Key (PK) identifies the field as the primary key of the table and

Days to migrate the Windows project to Linux, and then log on to the user table can not find the error message.Check that the name of the table in the discovery database is M_user, and then remembered that it was a case.Find the cause of the problem

1. Create database create database lush;2. Delete Database drop database lush;3. Select the database use lush;4. Create user Grant  all on *.* to  ' lush ' @ '% '  identified by  ' 123456 '; 5. CREATE TABLE create  Table zhu (Id int,name varchar (20)

Because the web uses MVC, the database uses MySQL. In order to facilitate development, under the Windows7 also installed a MySQL, today in the creation of the table, encountered a tricky problem. All the table names turn into lowercase, which is not

Note: This article is reproduced from http://www.hollischuang.com/archives/914In computer science, a lock is a synchronization mechanism used to forcibly restrict access to resources when executing multiple threads, which is used to guarantee the

I. MySQL report table error when executing select: is marked as crashed and last (automatic?)Here's how to fix it:Locate the Bin/myisamchk tool for the MySQL installation directory and enter it at the command line:Myisamchk-c-R. /data/dedecmsv4/dede_

Problem Scenario:Commodity table goods, there are several large text fields, type with the Mediumtext, table records more than 280,000. Paging query with limit, on the average PC needs about 12 seconds, this order of magnitude of data should not be

A recent project is to use SOLR to do full-text search and start elephant. Start with Tomcat 7 configuration, start normal, but encountered in the cookie in Chinese is an error. Helpless, for Tomcat 6, the result Dataimporthandler will be

The time format passed by the front end is "2016-07-11 11:13:10", and the format of the corresponding field ' Add_time ' in the datasheet is "2016-7-11", when SQL cannot be used directly with "where ' add_time ' = ' 2016-07-11 11:13:10 '. This can

The following several statements are queried, but how to navigate to the corresponding process also requires learning the structure of these tables.SELECT * FROM Information_schema.innodb_trx # # All transactions currently runningSELECT * FROM

#encoding =utf-8import xlrdimport mysqldbdata=xlrd.open_workbook (' test.xlsx ') table=data.sheets () [0]nrows= Table.nrowsncols=table.ncolstabledict={}for i in range (nrows): Tabledict[i]=table.row_values (i) print tabledict[2] Print tuple

Http://www.2cto.com/database/201202/121253.html 1, MySQL is case-sensitive by default, use show Variables like '%table_names ' to view Lower_ The value of the Case_table_names, 0 stands for the distinction, 1 represents not differentiated.2, MySQL

View case SensitivityMysql> Show variables like "%case%";+------------------------+-------+| variable_name | Value |+------------------------+-------+| Lower_case_file_system | OFF || Lower_case_table_names | 0 |+------------------------+-------+2

1. SQL statements UsedINSERT into table name (field list) VALUES (list of values), (value list) ...;Attention:1), the field list to correspond to the Value List 2), when inserting data into all the fields in the table, you can omit the field list2.